Two-step process for synthesis of a single phase Na–A zeolite from coal fly ash by dialysis

Tanaka, Hidekazu; Eguchi, Hajime; Fujimoto, Satoshi; Hino, Ryozi

doi:10.1016/j.fuel.2005.12.022

Cited by 73 publications

(45 citation statements)

References 18 publications

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“…Some authors have employed different treatments using higher concentrations of NaOH, temperature 14,15 or pretreatment by alkaline fusion 3,4 to facilitate the dissolution of the Si and Al oxides present. The concentration of NaOH was approximately 3.3 mol.L -1 in this synthesis.…”

Section: Zeolite a Synthesismentioning

confidence: 99%

“…The synthesis of NaP1 zeolites by the hydrothermal treatment of ashes have shown good results for the adsorption of heavy metals 2 . The synthesis of Na-A and Na-X have used hydrothermal treatments 3 and are associated with alkaline ash fusion 4 . Yaping et al (2008) 5 synthesized three different materials, Na-A, Na-X and NaP1, by alkaline fusion with sodium carbonate, desilification and a hydrothermal process.…”

Section: Introductionmentioning

confidence: 99%

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Zeolite A synthesis employing a brazilian coal ash as the silicon and aluminum source and its applications in adsorption and pigment formulation

2012

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Zeolite A was synthesized using the coal ash from Siderópolis/RS -Brazil. The synthesis was based on a standard IZA synthesis using coal ash as the Si and Al source. XRF analysis showed that the coal ash has a Si/Al ratio of 1.52, which is close to the Si/Al ratio required to produce zeolite A (1.0). The synthesized materials were analyzed by XRD, SEM and N 2 adsorption. More crystalline materials were obtained during synthesis when an additional treatment was applied at a temperature of 353 K at the dissolution of NaOH step. The product formed after 4 hours was the most crystalline, but even the product formed after 1 hour proved to be better than that formed using the standard 4 hours IZA synthesis. The zeolites synthesized by this method had an adsorption capacity of 120 mg.g -1 for Ca 2+ , half the capacity of commercial zeolite A (300 mg.g -1 ). It was not possible to obtain blue or green pigments using the synthesized zeolite A.

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Section: Zeolite a Synthesismentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Zeolite A synthesis employing a brazilian coal ash as the silicon and aluminum source and its applications in adsorption and pigment formulation

2012

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“…Over recent years, unconventional starting materials such as coal fly ash [2][3][4][5][6][7][8], metakaolin [9], cupola slag and aluminum sludge [10], municipal solid waste ash [11], chrysotile and rice husk [12] have also been used to synthesize zeolites. The synthesis of zeolite from coal fly ash was pioneered by Holler and Wirsching [13], and since then numerous researchers have followed in synthesizing different types of zeolites [5].…”

Section: Introductionmentioning

confidence: 99%

“…Zeolite A, which is denoted by International Zeolite Association (IZA) code as Linde Type A (LTA) [15] has successfully been synthesized from coal fly ash [3,4,17] and has industrial applications such as in separation, ion exchange, sequestration of CO2 and catalysis among many other applications [1,16]. The use of fly ash based zeolites in catalysis has mostly been hindered by the lack of purity but recent studies have shown that pure phase zeolite A [3,4,17] could act as an alternative to the commercially available catalysts based on zeolite A. For example, Hui and Chao [18] applied fly ash-derived zeolite A in catalytic combustion of methane.…”

Section: Introductionmentioning

confidence: 99%

In situ ultrasonic monitoring of zeolite A crystallization from coal fly ash

Musyoka

Petrik

Hums³

et al. 2012

Catalysis Today

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In this study, high phase purity of zeolite A was prepared from coal fly ash precursors. The molar regime of both the clear solution extract and unseparated fly ash slurry was adjusted to achieve the right com-position for zeolite A crystallization. The formation process for zeolite A from coal fly ash precursors was monitored in detail using an in situ ultrasonic system and was complemented by use of ex situ techniques such as XRD, FTIR, SEM and FTIR. The findings from both the in situ ultrasonic monitoring process and ex situ techniques clearly contributed significantly in unmasking the formation process of zeolite A from coal fly ash compared to previous studies reported in the literature. The study also enriches the existing body of literature by deeply investigating the gel-solutioncrystal interactions starting from this complex feedstock. Comparable ultrasonic signals were generated when both clear and unseparated fly ash based precursor solutions were used during the zeolite synthesis process.

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“…The study of RHA (rice husk ash) showed high content of silica and alumina similar to raw materials typically used in zeolite synthesis [3]. These raw materials can be coal fly ash [4,5], oil shale ash [6], and bagasse fly ash [7]. Therefore, rice husk ash is a potential raw material for zeolite synthesis.…”

Section: Introductionmentioning

confidence: 99%

Characterization of Thailand Rice Husk Ash from Biomass Power Plant and Synthesized Zeolite

Santasnachok¹,

Kurniawan²,

Hinode³

2015

JLS

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Thailand rice husk ash was used to synthesize zeolite by hydrothermal treatment. Raw rice husk ash material and zeolitic products were characterized in terms of specific surface area (BET method), morphological analysis (SEM), mineralogical composition (XRD) and CEC (cation exchange capacity). LOI (Loss of ignition) of rice husk ash was also evaluated. Result indicated that the rice husk ash sample from Roi-Et Green power plant in the Northeastern of Thailand with combustion temperature of 650 °C has a high content of SiO 2 (above 90 wt.%). Zeolite-X from rice husk ash with high content of Si was successfully synthesized using hydrothermal treatment. The zeolitic material synthesized with the optimal condition possessed a maximum value of CEC of 503 meq/100g, and it has potentiality to be used as ion exchangers.

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Two-step process for synthesis of a single phase Na–A zeolite from coal fly ash by dialysis

Cited by 73 publications

References 18 publications

Zeolite A synthesis employing a brazilian coal ash as the silicon and aluminum source and its applications in adsorption and pigment formulation

Zeolite A synthesis employing a brazilian coal ash as the silicon and aluminum source and its applications in adsorption and pigment formulation

In situ ultrasonic monitoring of zeolite A crystallization from coal fly ash

Characterization of Thailand Rice Husk Ash from Biomass Power Plant and Synthesized Zeolite

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